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| 1 | In-Situ Differentiation of Acidic and Non-Acidic Tundra via Portable X-ray Fluorescence (PXRF) Spectrometry显示文摘Frozen soils or those with permafrost cover large areas of the earth's surface and support unique vegetative ecosystems. Plants growing in such harsh conditions have adapted to small niches, which allow them to survive. In northern Alaska, USA, both moist acidic and non-acidic tundra occur, yet determination of frozen soil p Hs currently requires thawing of the soil so that electrometric pH methods can be utilized. Contrariwise, a portable X-ray fluorescence(PXRF) spectrometer was used in this study to assess elemental abundances and relate those characteristics to soil pH through predictive multiple linear regressions. Two operational modes, Soil Mode and Geochem Mode, were utilized to scan frozen soils in-situ and under laboratory conditions, respectively, after soil samples were dried and ground. Results showed that lab scanning produced optimal results with adjusted coefficient of determination(R^2) of 0.88 and 0.33 and root mean squared errors(RMSEs) of 0.87 and 0.34 between elemental data and lab-determined pH for Soil Mode and Geochem Mode, respectively. Even though the presence of ice attenuated fluoresced radiation under field conditions, adjusted R^2 and RMSEs between the datasets still provided reasonable model generalization(e.g., 0.73 and 0.49 for field Geochem Mode). Principal component analysis qualitatively separated multiple sampling sites based on elemental data provided by PXRF, reflecting differences in the chemical composition of the soils studied. Summarily, PXRF can be used for in-situ determination of soil pH in arctic environments without the need for sample modification and thawing. Furthermore, use of PXRF for determination of soil pH may provide higher sample throughput than traditional eletrometric-based methods, while generating elemental data useful for the prediction of multiple soil parameters. | Somsubhra CHAKRABORTY David C. WEINDORF GARY J. MICHAELSON Chien Lu PING Ashok CHOUDHURY Tarek KANDAKJI Autumn ACREE Akriti SHARMA WANG Dandan | 2016 | Pedosphere2016，26，4： | 4 |
| 2 | Spectrum of Cytogenomic Abnormalities Revealed by Array Comparative Genomic Hybridization on Products of Conception Culture Failure and Normal Karyotype Samples显示文摘Approximately 30% of pregnancies after implantation end up in spontaneous abortions, and 50% of them are caused by chromosomal abnormalities. However, the spectrum of genomic copy number variants(CNVs) in products of conception(POC) and the underlying genedosage-sensitive mechanisms causing spontaneous abortions remain largely unknown. In this study, array comparative genomic hybridization(a CGH) analysis was performed as a salvage procedure for 128 POC culture failure(POC-CF) samples and as a supplemental procedure for106 POC normal karyotype(POC-NK) samples. Chromosomal abnormalities were detected in 10% of POC-CF and pathogenic CNVs were detected in 3.9% of POC-CF and 5.7% of POC-NK samples. Compiled results from this study and relevant case series through a literature review demonstrated an abnormality detection rate(ADR) of 35% for chromosomal abnormalities in POC-CF samples, 3.7% for pathogenic CNVs in POC-CF samples, and 4.6% for pathogenic CNVs in POC-NK samples. Ingenuity Pathway Analysis(IPA) was performed on the genes from pathogenic CNVs found in POC samples. The denoted primary gene networks suggested that apoptosis and cell proliferation pathways are involved in miscarriage. In summary, a similar spectrum of cytogenomic abnormalities was observed in POC culture success and POC-CF samples. A threshold effect correlating the number of dosage-sensitive genes in a chromosome with the observed frequency of autosomal trisomy is proposed. A rationalized approach using firstly fluorescence in situ hybridization(FISH) testing with probes of chromosomes X/Y/18, 13/21, and 15/16/22 for common aneuploidies and polyploidies and secondly a CGH for other cytogenomic abnormalities is recommended for POC-CF samples. | Qinghua Zhou Shen-Yin Wu Katherine Amato Autumn DiAdamo Peining Li | 2016 | Journal of Genetics and Genomics2016，43，3： | 3 |
| 3 | Adhesive Force of a Single Gecko Foot-hair显示文摘 | Autumn K Liang Y A Hsieh S T | 2000 | Nature2000，405，6： | 1 |
| 4 | Adhesive force of a single gecko foot-hair显示文摘 | Autumn K Liang Y A Hsieh T | 2000 | Nature2000，405，： | 1 |
| 5 | Adhesive force of a single gecko foot-hair 显示文摘 | Autumn K Liang Y A Hsieh S T | 2000 | Nature2000，405，6： | 1 |
| 6 | Adhesive force of a single gecko foot-hair显示文摘 | AUTUMN K LIANG Y A HSIEH T | 2000 | Nature2000，405，8： | 1 |
| 7 | 查看详情显示文摘 | Autumn K Liang Y A Hsieh S T | | 0，，： | 1 |
| 8 | Adhesion force of a single gecko foot - hair 显示文摘 | Autumn K Chang W P Hsieh T | 2000 | Nature2000，405，8： | 1 |
| 9 | Adhesive force of a single gecko foot-hair 显示文摘 | AUTUMN K LIANG Y A HSIEH S T | 2000 | Nature2000，405，6787： | 1 |
| 10 | Adhesive Force of a Single Gecko Foot-hair显示文摘 | Autumn K Liang Y A Hsieh S T | 2000 | Nature2000，405，6： | 1 |
| 11 | Adhesive force of a single gecko foot-hair显示文摘 | AUTUMN K LIANG Y A HSIEH S T | 2000 | Nature2000，，405： | 1 |
| 12 | Adhesive force of a single gecko foot-hair 显示文摘 | Autumn K Hang Y A Hsieh T | 2000 | Nature2000，405，8： | 1 |
| 13 | Human Sense of Direction and Way Finding显示文摘 | Edward H Cornell Autumn Sorenson Teresa Mio | 2003 | Annals of Association of American Geographers2003，93，2： | 1 |
| 14 | Evidence for van der waals adhesion in gecko setae显示文摘 | AUTUMN K SITTI M LIANG Y A | 2002 | PNAS2002，，12： | 1 |
| 15 | Adhesive force of a single gecko foot-hair显示文摘 | Autumn K Liang Y A Hsieh S T | 2000 | Nature2000，405，2： | 1 |
| 16 | Evidence for van der Waals adhesion in geckosetae 显示文摘 | Autumn K Metin Sitti Liang Y | 2002 | Pnas2002，99，12： | 1 |
| 17 | Nature显示文摘 | Autumn K Liang Y A Hsich T Zeach W Zesch W Chan W P Kenny T Fearing R Full R J | 2000 | (405 ) :681 -6852000，，405： | 1 |
| 18 | Adhesive force of a single gecko foot-hair显示文摘 | Autumn K Liang Y A Hsieh S T | | 0，，6787： | 1 |
| 19 | Mechanisms of adhesion in geckos显示文摘 | Autumn K Peattie A M | | 0，，06： | 1 |
| 20 | Evidence for van der Waals adhesion in gecko setae显示文摘 | Autumn K | 2002 | Proc Natl Acad Sci USA2002，9909，12： | 1 |
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